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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72720e3f3106fb695aa3cbdb5456c0945014676d46b5ef844d4d5ab8968f0d93' 
  AND token = 'ktRehZ28R6px1Mb2ta8NCVsRBAPxmajhkxWV2t7w+og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}